Kate’s Bombay Potato Curry Pie recipe - The Great British Bake Off

Ingredients

• 700g waxy potatoes, peeled, and cut into 1.5–2cm dice
• 2 tbsp rapeseed or sunflower oil
• 2 medium–large onions, finely chopped
• 2 tsp brown mustard seeds
• 1 tsp cumin seeds
• 1 tsp black onion seeds
• 3 large garlic cloves, finely chopped
• 4cm piece of root ginger, peeled and finely grated (to give about 15g)
• 1 tsp ground cumin
• 1 tbsp curry powder, or to taste
• 1 tbsp garam masala, or to taste
• ½ tsp chilli powder, or to taste
• ½ tsp ground coriander
• 1 tsp ground turmeric
• ¼ tsp salt, or to taste
• ground black pepper
• 3 medium–large tomatoes
• 100g strong white bread flour
• 450g plain flour
• 1½ tbsp ground turmeric
• 75g unsalted butter, chilled and diced
• 100g solid vegetable fat, made for baking, diced
• ½ tsp salt
• 1 egg, beaten, to glaze
• 2 tbsp caster sugar
• ½–1 medium–hot red chilli, deseeded and thinly sliced, to taste
• 1 very large or 2 medium ripe mangoes, peeled and stoned
• 1 tsp black onion seeds, for sprinkling